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[PATCH] remove horrors with irix tty ioctls handling 

Existing code in there (get_tty(), etc.) is both severely
racy *and* pointless: ioctls in question have Linux equivalents
and there's no need to play silly buggers in irix_ioctl() -
just need to replace arguments and, in case of TIOCGSID,
deal with API differences - Linux one expects pid_t __user *
while Irix one does unsigned long __user *.  BFD...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-04-23 00:49:25 -04:00
parent 74d92abc61
commit bf7da7bcfb
1 changed files with 9 additions and 46 deletions
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55
arch/mips/kernel/irixioctl.c
View File

@ -27,33 +27,6 @@ struct irix_termios {
cc_t c_cc[NCCS];
};
extern void start_tty(struct tty_struct *tty);
static struct tty_struct *get_tty(int fd)
{
struct file *filp;
struct tty_struct *ttyp = NULL;
rcu_read_lock();
filp = fcheck(fd);
if(filp && filp->private_data) {
ttyp = (struct tty_struct *) filp->private_data;
if(ttyp->magic != TTY_MAGIC)
ttyp =NULL;
}
rcu_read_unlock();
return ttyp;
}
static struct tty_struct *get_real_tty(struct tty_struct *tp)
{
if (tp->driver->type == TTY_DRIVER_TYPE_PTY &&
tp->driver->subtype == PTY_TYPE_MASTER)
return tp->link;
else
return tp;
}
asmlinkage int irix_ioctl(int fd, unsigned long cmd, unsigned long arg)
{
struct tty_struct *tp, *rtp;
@ -146,34 +119,24 @@ asmlinkage int irix_ioctl(int fd, unsigned long cmd, unsigned long arg)
error = sys_ioctl(fd, TIOCNOTTY, arg);
break;
case 0x00007416:
case 0x00007416: {
pid_t pid;
#ifdef DEBUG_IOCTLS
printk("TIOCGSID, %08lx) ", arg);
#endif
tp = get_tty(fd);
if(!tp) {
error = -EINVAL;
break;
}
rtp = get_real_tty(tp);
#ifdef DEBUG_IOCTLS
printk("rtp->session=%d ", rtp->session);
#endif
error = put_user(rtp->session, (unsigned long __user *) arg);
old_fs = get_fs(); set_fs(get_ds());
error = sys_ioctl(fd, TIOCGSID, (unsigned long)&pid);
set_fs(old_fs);
if (!error)
error = put_user(pid, (unsigned long __user *) arg);
break;
}
case 0x746e:
/* TIOCSTART, same effect as hitting ^Q */
#ifdef DEBUG_IOCTLS
printk("TIOCSTART, %08lx) ", arg);
#endif
tp = get_tty(fd);
if(!tp) {
error = -EINVAL;
break;
}
rtp = get_real_tty(tp);
start_tty(rtp);
error = sys_ioctl(fd, TCXONC, TCOON);
break;
case 0x20006968: